Patents by Inventor Akiyoshi Watanabe

Akiyoshi Watanabe has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210262787
    Abstract: A three-dimensional measurement device includes one or a plurality of light source units configured to irradiate the object to be measured SA with measurement light having a predetermined pattern, one or a plurality of image capture units configured to capture an image of the object to be measured which is irradiated with the measurement light, and a measurement unit configured to measure a three-dimensional shape of the object to be measured on the basis of results of image capture performed by the image capture units. The light source units are constituted by an S-iPMSEL of M-point oscillation.
    Type: Application
    Filed: February 12, 2021
    Publication date: August 26, 2021
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Kazuyoshi HIROSE, Hiroki KAMEI, Takahiro SUGIYAMA, Akiyoshi WATANABE
  • Patent number: 10938177
    Abstract: To provide a two-dimensional photonic crystal surface emitting laser capable of improving characteristics of light to be emitted, in particular, optical output power. The two-dimensional photonic crystal surface emitting laser includes: a two-dimensional photonic crystal including a plate-shaped base member and modified refractive index regions where the modified refractive index regions have a refractive index different from that of the plate-shaped base member and are two-dimensionally and periodically arranged in the base member; an active layer provided on one side of the two-dimensional photonic crystal; and a first electrode and a second electrode provided sandwiching the two-dimensional photonic crystal and the active layer for supplying current to the active layer, where the second electrode covers a region equal to or wider than the first electrode.
    Type: Grant
    Filed: September 27, 2019
    Date of Patent: March 2, 2021
    Assignees: KYOTO UNIVERSITY, ROHM CO., LTD., HAMAMATSU PHOTONICS K.K., MITSUBISHI ELECTRIC CORPORATION
    Inventors: Susumu Noda, Hitoshi Kitagawa, Yong Liang, Akiyoshi Watanabe, Kazuyoshi Hirose
  • Publication number: 20200028327
    Abstract: To provide a two-dimensional photonic crystal surface emitting laser capable of improving characteristics of light to be emitted, in particular, optical output power. The two-dimensional photonic crystal surface emitting laser includes: a two-dimensional photonic crystal including a plate-shaped base member and modified refractive index regions where the modified refractive index regions have a refractive index different from that of the plate-shaped base member and are two-dimensionally and periodically arranged in the base member; an active layer provided on one side of the two-dimensional photonic crystal; and a first electrode and a second electrode provided sandwiching the two-dimensional photonic crystal and the active layer for supplying current to the active layer, where the second electrode covers a region equal to or wider than the first electrode.
    Type: Application
    Filed: September 27, 2019
    Publication date: January 23, 2020
    Applicants: KYOTO UNIVERSITY, ROHM CO., LTD., HAMAMATSU PHOTONICS K.K., MITSUBISHI ELECTRIC CORPORATION
    Inventors: Susumu NODA, Hitoshi KITAGAWA, Yong LIANG, Akiyoshi WATANABE, Kazuyoshi HIROSE
  • Patent number: 10461501
    Abstract: To provide a two-dimensional photonic crystal surface emitting laser capable of improving characteristics of light to be emitted, in particular, optical output power.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: October 29, 2019
    Assignees: KYOTO UNIVERSITY, ROHM CO., LTD., HAMAMATSU PHOTONICS K.K., MITSUBISHI ELECTRIC CORPORATION
    Inventors: Susumu Noda, Hitoshi Kitagawa, Yong Liang, Akiyoshi Watanabe, Kazuyoshi Hirose
  • Patent number: 10186837
    Abstract: A control circuit in this laser equipment drives a drive circuit of a photonic crystal laser element under a predetermined condition. It was found that a wavelength width of a laser beam to be output from the photonic crystal laser element is dependent on a standardized drive current k and a pulse width T, and had a predetermined relationship with these. By meeting this condition, a laser beam with a plurality of wavelengths can be controlled and output.
    Type: Grant
    Filed: February 13, 2015
    Date of Patent: January 22, 2019
    Assignees: Kyoto University, HAMAMATSU PHOTONICS K.K.
    Inventors: Kazuyoshi Hirose, Akiyoshi Watanabe, Yoshitaka Kurosaka, Takahiro Sugiyama, Susumu Noda
  • Publication number: 20170256911
    Abstract: A two-dimensional photonic crystal surface emitting laser capable of improving characteristics of light to be emitted, particularly optical output , which includes: a two-dimensional photonic crystal including a plate-shaped base member and modified refractive index regions where the modified refractive index regions have a refractive index different from that of the plate-shaped base member and are two-dimensionally and periodically arranged in the base member; an active layer provided on one side of the two-dimensional photonic crystal; and a first electrode and a second electrode provided sandwiching the two-dimensional photonic crystal and the active layer for supplying current to the active layer, where the second electrode covers a region equal to or wider than the first electrode, wherein the first electrode is formed so as to supply the current to the active layer with a different density depending on the in-plane position on the first electrode.
    Type: Application
    Filed: August 28, 2015
    Publication date: September 7, 2017
    Applicants: KYOTO UNIVERSITY, ROHM CO., LTD., HAMAMATSU PHOTONICS K.K., MITSUBISHI ELECTRIC CORPORATION
    Inventors: Susumu NODA, Hitoshi KITAGAWA, Yong LIANG, Akiyoshi WATANABE, Kazuyoshi HIROSE
  • Publication number: 20170222399
    Abstract: A control circuit in this laser equipment drives a drive circuit of a photonic crystal laser element under a predetermined condition. It was found that a wavelength width of a laser beam to be output from the photonic crystal laser element is dependent on a standardized drive current k and a pulse width T, and had a predetermined relationship with these. By meeting this condition, a laser beam with a plurality of wavelengths can be controlled and output.
    Type: Application
    Filed: February 13, 2015
    Publication date: August 3, 2017
    Inventors: Kazuyoshi HIROSE, Akiyoshi WATANABE, Yoshitaka KUROSAKA, Takahiro SUGIYAMA, Susumu NODA
  • Patent number: 9722396
    Abstract: A surface emitting laser element capable of emitting a main beam and a sub-beam, and a monitoring light detection element capable of detecting a light intensity of the sub-beam are included, the surface emitting laser element is a PCSEL, the main beam and the sub-beam are emitted in an upward direction of the surface emitting laser element and are inclined to each other at a predetermined angle, and respective changes in a peak light intensity of the main beam and a peak light intensity of the sub-beam with respect to a value of a driving current of the surface emitting laser element are correlated with each other. Therefore, if an output of the monitoring light detection element indicating the peak light intensity of the sub-beam is used, the peak light intensity of the main beam can be estimated.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: August 1, 2017
    Assignees: KYOTO UNIVERSITY, HAMAMATSU PHOTONICS K.K.
    Inventors: Akiyoshi Watanabe, Yoshitaka Kurosaka, Kazuyoshi Hirose, Takahiro Sugiyama, Susumu Noda
  • Patent number: 9713857
    Abstract: To obtain a laser joining structure and a laser joining method that can suppress a decrease in strength or rigidity of a third plate that is disposed at an interval apart from at least two metal plates. A laser joining structure has at least two metal plates whose superposed region, at which the at least two metal plates are superposed with one another, is joined by laser welded portions at two or more places, and a third plate that is disposed at an interval apart from the superposed region. A through-portion, that passes-through the third plate and through which laser light is irradiated onto the superposed region and that is of a number that is less than a number of the laser welded portions, is formed in the third plate.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: July 25, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshimune Shimada, Akiyoshi Watanabe, Hideyuki Yoshioka, Yoshio Nakamura, Norimasa Koreishi
  • Patent number: 9698562
    Abstract: In a laser device, a different refractive index region 6B of a photonic crystal layer is arranged at a lattice point position of a square lattice. In the case where a plane shape of the different refractive index regions 6B is a nearly isosceles right triangle, two sides forming a right angle extend along longitudinal and horizontal lateral lines of the square lattice. A direction parallel to or vertical to an oblique side of the triangle and a direction of polarization in the periodic polarization inversion structure of a nonlinear optical crystal NL are the same.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: July 4, 2017
    Assignees: Kyoto University, HAMAMATSU PHOTONICS K.K.
    Inventors: Akiyoshi Watanabe, Kazuyoshi Hirose, Yoshitaka Kurosaka, Takahiro Sugiyama, Susumu Noda
  • Patent number: 9667028
    Abstract: In a laser device, a different refractive index region 6B of a photonic crystal layer is arranged at a lattice point position of a square lattice. In the case where a plane shape of the different refractive index regions 6B is a nearly isosceles right triangle, two sides forming a right angle extend along longitudinal and horizontal lateral lines of the square lattice. A direction parallel to or vertical to an oblique side of the triangle and a direction of polarization in the periodic polarization inversion structure of a nonlinear optical crystal NL are the same.
    Type: Grant
    Filed: March 7, 2014
    Date of Patent: May 30, 2017
    Assignees: Kyoto University, HAMAMATSU PHOTONICS K.K.
    Inventors: Akiyoshi Watanabe, Kazuyoshi Hirose, Yoshitaka Kurosaka, Takahiro Sugiyama, Susumu Noda
  • Patent number: 9583914
    Abstract: A semiconductor laser element is realized with high beam quality (index M2<1). A diffraction grating 6ba of a diffraction grating layer 6 extends along a principal surface 2a and is provided on a p-side surface 6a of the diffraction grating layer 6; the refractive index of the diffraction grating layer 6 periodically varies in directions extending along the principal surface 2a, in the diffraction grating 6ba; the diffraction grating 6ba has a plurality of holes 6b; the plurality of holes 6b are provided in the p-side surface 6a and arranged in translational symmetry along a square lattice R3; the plurality of holes 6b each have the same size and shape; each hole 6b corresponds to a lattice point of the diffraction grating 6ba and is of a triangular prism shape; a shape of a bottom face 6c of the hole 6b is an approximate right triangle.
    Type: Grant
    Filed: February 27, 2014
    Date of Patent: February 28, 2017
    Assignees: Kyoto University, HAMAMATSU PHOTONICS K.K.
    Inventors: Kazuyoshi Hirose, Akiyoshi Watanabe, Yoshitaka Kurosaka, Takahiro Sugiyama, Susumu Noda
  • Publication number: 20170012407
    Abstract: A surface emitting laser element capable of emitting a main beam and a sub-beam, and a monitoring light detection element capable of detecting a light intensity of the sub-beam are included, the surface emitting laser element is a PCSEL, the main beam and the sub-beam are emitted in an upward direction of the surface emitting laser element and are inclined to each other at a predetermined angle, and respective changes in a peak light intensity of the main beam and a peak light intensity of the sub-beam with respect to a value of a driving current of the surface emitting laser element are correlated with each other. Therefore, if an output of the monitoring light detection element indicating the peak light intensity of the sub-beam is used, the peak light intensity of the main beam can be estimated.
    Type: Application
    Filed: November 10, 2014
    Publication date: January 12, 2017
    Inventors: Akiyoshi WATANABE, Yoshitaka KUROSAKA, Kazuyoshi HIROSE, Takahiro SUGIYAMA, Susumu NODA
  • Patent number: 9399491
    Abstract: A joint structure for a vehicle body member, the vehicle body member including at least two panel members, the at least two panel members constituting part of a vehicle body and being formed of a steel plate, the joint structure includes: spot-welds formed by spot-welding the at least two panel members to each other at a predetermined spot interval such that a predetermined clearance is formed between the at least two panel members; a laser-weld formed by laser-welding the at least two panel members to each other between the spot-welds; and an electrodeposition coating film portion that covers a surface of each of the at least two panel members, at least part of the electrodeposition coating film portion filling the clearance.
    Type: Grant
    Filed: October 14, 2014
    Date of Patent: July 26, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Akiyoshi Watanabe, Norimasa Koreishi
  • Publication number: 20160020581
    Abstract: A semiconductor laser element is realized with high beam quality (index M2<1). A diffraction grating 6ba of a diffraction grating layer 6 extends along a principal surface 2a and is provided on a p-side surface 6a of the diffraction grating layer 6; the refractive index of the diffraction grating layer 6 periodically varies in directions extending along the principal surface 2a, in the diffraction grating 6ba; the diffraction grating 6ba has a plurality of holes 6b; the plurality of holes 6b are provided in the p-side surface 6a and arranged in translational symmetry along a square lattice R3; the plurality of holes 6b each have the same size and shape; each hole 6b corresponds to a lattice point of the diffraction grating 6ba and is of a triangular prism shape; a shape of a bottom face 6c of the hole 6b is an approximate right triangle.
    Type: Application
    Filed: February 27, 2014
    Publication date: January 21, 2016
    Inventors: Kazuyoshi HIROSE, Akiyoshi WATANABE, Yoshitaka KUROSAKA, Takahiro SUGIYAMA, Susumu NODA
  • Publication number: 20160020576
    Abstract: In a laser device, a different refractive index region 6B of a photonic crystal layer is arranged at a lattice point position of a square lattice. In the case where a plane shape of the different refractive index regions 6B is a nearly isosceles right triangle, two sides forming a right angle extend along longitudinal and horizontal lateral lines of the square lattice. A direction parallel to or vertical to an oblique side of the triangle and a direction of polarization in the periodic polarization inversion structure of a nonlinear optical crystal NL are the same.
    Type: Application
    Filed: March 7, 2014
    Publication date: January 21, 2016
    Inventors: Akiyoshi WATANABE, Kazuyoshi HIROSE, Yoshitaka KUROSAKA, Takahiro SUGIYAMA, Susumu NODA
  • Patent number: 9227666
    Abstract: A vehicle frame structure includes a pair of hat-shaped panels that form a portion of a vehicle, each hat-shaped panel having a hat-shaped cross-section, the pair of hat-shaped panels facing each other and forming a closed sectional portion; a partition panel that is sandwiched by the pair of hat-shaped panels, and divides an inside of the closed sectional portion; and a laser welded portion where all of four or more plates including the pair of hat-shaped panels and the partition panel are overlapped and welded together at an identical position by laser welding.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: January 5, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hideyuki Yoshioka, Akiyoshi Watanabe, Norimasa Koreishi, Kentaro Adachi
  • Patent number: 9219348
    Abstract: The present edge-emitting semiconductor layer element includes two-dimensional photonic crystals 4 formed in a semiconductor layer, and when one direction of a contact region of an electrode 8 is provided as a length direction (X-direction) and a direction perpendicular to both of the length direction and a thickness direction of a substrate is provided as a width direction (Y-direction), the two-dimensional photonic crystals 4 are, when viewed from a direction (Z-axis) perpendicular to the substrate, located in a region containing the electrode contact region and wider in the width direction than the contact region, and have a refractive index periodic structure in which the refractive index satisfies a Bragg's diffraction condition while periodically changing at every interval along the one direction (X-axis).
    Type: Grant
    Filed: February 29, 2012
    Date of Patent: December 22, 2015
    Assignees: Kyoto University, HAMAMATSU PHOTONICS K.K.
    Inventors: Akiyoshi Watanabe, Kazuyoshi Hirose, Kousuke Shibata, Takahiro Sugiyama, Yoshitaka Kurosaka, Susumu Noda
  • Patent number: 9130339
    Abstract: When an end-face-emitting photonic crystal laser element 10 is seen in an X axis, one end of an upper electrode E2 overlaps a laser light exit surface SF, the upper electrode E2 and an opposite end face SB are separated from each other, the upper electrode E2 is separated from both lateral end faces SR, SL, and one end of an active layer 3B overlaps the laser light exit surface SF.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: September 8, 2015
    Assignees: KYOTO UNIVERSITY, HAMAMATSU PHOTONICS K.K.
    Inventors: Susumu Noda, Yoshitaka Kurosaka, Akiyoshi Watanabe, Kazuyoshi Hirose, Takahiro Sugiyama
  • Publication number: 20150209909
    Abstract: Provided are: a laser-bonded structure wherein deterioration of strength or rigidity of a third plate is suppressed, said third plate being disposed by being spaced apart from at least two metal plates; and a laser bonding method. The laser-bonded structure is provided with: at least two metal plates, which have two or more overlapping portions where the metal plates are disposed in a state wherein the metal plates are overlapping each other, and which are bonded by means of laser welding sections; and a third plate that is disposed by being spaced apart from the overlapping portions. The third plate has formed therein penetrating sections of a number smaller than the number of the laser welding sections, said penetrating sections penetrating the third plate, and having laser light radiated to the overlapping portions.
    Type: Application
    Filed: November 27, 2012
    Publication date: July 30, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshimune Shimada, Akiyoshi Watanabe, Hideyuki Yoshioka, Yoshio Nakamura, Norimasa Koreishi